92rs365hp

where is the FP relay on a 91 Z28 with a 305 tpi cannot find it please help....

Apeiron

On the firewall relay bracket behind the brake booster.

bingo

iTrader: (2)

It is mounted on the firewall to the right of the wiper motor and behind the brake booster. It will be with other relays in a little cluster. It should be the one farthest to the left.

92rs365hp

ok I think I found it now my other question is....I have 3 month old napa pump that I cannot hear kick on the car ran for like 5 min and then quit then 4 min and so on now wont but will crank FP read 40-45 then when it died it went to 20.....could the relay be causing this or do I need a new pump??

steve

Apeiron

Could be the relay, could be the pump.

92rs365hp

ok I have a new ac pump on the way so I think I will go get a new relay tomorrow

pentiuman

I agree. I had an 83 Firebird that quit running. Towed to shop, who replaced tons of stuff, then when I picked it up and it ran like crap, said it had an electrical problem. Had towed to an electrical shop, who replaced the fuel pump. Lasted less than 10 miles and died. Fuel pump wasn't working. Dumb electrical shop replaced the fuel pump again, this time with a better brand. 2nd pump died. Electrical shop blamed the gas additive I put in and/or the 10% ethanol gas from Quicktrip, who had their new gas "guarantee", (this was 12+ years ago, before everyone started using ethanol in their gas). They put in a 3rd fuel pump, charging me this time for all 3 pumps. This one lasted just a few blocks. I then had the car towed out of town to a dealership, who diagnosed the fuel pump as bad. duh. But they also said that it probably had a bad fuel pump relay, which was killing the new fuel pumps. This was exactly what I suspected in the first place, (an electrical problem). By this time, I was running out of money, so I pushed the car out of the dealership's parking lot, down the street. Replaced the in-tank electric fuel pump myself, and the $4 fuel pump relay. Presto. Problem solved. Meanwhile, I also sent a sample of my gas to the fuel additive manufacturer, who analyzed it and said their product was not at fault, but it could be the ethanol gas from Quicktrip, which was 14% ethanol. Quicktrip said I needed a receipt to make a claim, which I didn't have. I then got a lawyer, gathered electrical schematics, and sued the electrical shop. We subpeoned the car dealership who made the correct diagnosis to testify. The electrical shop's lawyer was good, and made my car dealership witness appear to be incompetent (when in fact, it was his client that was).

However, I "won", in so far as that I got a judgment against the electrical shop. It took months to get partial payment, and the shop went out of business. I lost in that I was stranded 4 times, having to walk on the side of the highway, late for college exams, and it really soured my feelings about my Firebird.

Bottome line is: "experts" make mistakes. good lawyers can make the guilty seem innocent, don't be afraid to work on your own car, and ask questions. So, yes, replace the fuel pump relay, because a defective one can kill your electric fuel pump.

RFmaster

Pentiuman
Very interesting and sad story, but for educational sake did you save the 'bad' relay???

These relays supposed to be very rugged - and were made by BOSCH and several other manufactures in USA. Contacts are rated 20/30 amps at 12Vdc, while OEM Fuel Pump draws about 3 to 5 Amps. The only reason why relay would flake out is due to intermittent winding or high contact resistance.

As I side note, after pulling a few from JY - I agree that relay socket contacts maybe the weak point. I have pulled a few relay - sockets that were toasted. See photo below:

http://i226.photobucket.com/albums/d...to173-crop.jpg

Apeiron

That looks pretty typical.